Eventhough these blackbirds are a common sight, I really love the sheen when the blue and purple are reflecting light the right way. I also marvel at their tails and wonder why are they shaped like that. Do they fly better? Do the females find it attractive? Grackles are somewhat difficult to separate sometimes from each other. The three species found in the North America are the Great-tailed, Boat-tailed and Common grackles. This one is identified by the size in between the other two with a deeply keeled tail and a dark eye. Also, only found in the south east of the States.